(3TQM bhGfjf GdGSJKeGQ (B/s - (3YHO GdaJGM eQGO s ((3GdGScfOQjI (B:s (3OGQ GdacQ GdLGeYi (B,s, 1990)
.393-401 (3HHdjhLQGajG(B: (3UaMGJ(B.s
(3GdfU HGddZI GdYQHjIs
Keywords: (3GdGSJKeGQ s; (3GdeGdjI GdYGeI h GdJTQjY GdVQjHi s